I personally struggle to believe in aliens mostly because of their motivation to go to Earth.
What do you think is the reason why they travel to Earth and on Earth?
They must have to fly around here quite a lot because otherwise we wouldn`t see so “many” crashes (Think of airplanes, they only crash so often because they are flying around all the time).
Also, why should they try to communicate with us humans/talk to governments? Do we have anything they want and if yes, why couldn’t they just take it without us noticing?